Susan Cayle Dunn, also known as Susan Gayle Stine, allegedly assumed the identity in July 2007 to secure the high-paid job, Seattlepi.com reported.
The dead woman was the wife of Dunn's ex-husband.
Dunn was hired on as the senior vice president of human resources for the Heart Association's Pacific Mountain Affiliate, said Seattle Police Det. Chris Hansen. For her work there, Dunn was paid nearly $95,000 a year.